package com.ruoyi.file.utils;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.LocalDate;
import java.util.Arrays;
import java.util.Objects;
import java.util.UUID;

import com.ruoyi.file.config.MinioConfig;
import io.minio.BucketExistsArgs;
import io.minio.MakeBucketArgs;
import io.minio.MinioClient;
import io.minio.PutObjectArgs;
import lombok.RequiredArgsConstructor;
import org.apache.commons.io.FilenameUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;
import com.ruoyi.common.core.exception.file.FileException;
import com.ruoyi.common.core.exception.file.FileNameLengthLimitExceededException;
import com.ruoyi.common.core.exception.file.FileSizeLimitExceededException;
import com.ruoyi.common.core.exception.file.InvalidExtensionException;
import com.ruoyi.common.core.utils.DateUtils;
import com.ruoyi.common.core.utils.StringUtils;
import com.ruoyi.common.core.utils.file.FileTypeUtils;
import com.ruoyi.common.core.utils.file.MimeTypeUtils;
import com.ruoyi.common.core.utils.uuid.Seq;

import javax.annotation.Resource;

/**
 * 文件上传工具类
 *
 * @author ruoyi
 */

public class FileUploadUtils {
    /**
     * 默认大小 50M
     */
    public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024L;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;
    public static final String  URL= "http://118.31.60.197:9000";
    public static final String ACCESS_KEY = "minioadmin";
    public static final String  SECRET_KEY= "minioadmin";
    public static final String BUCKET_NAME = "car-service";




    /**
     * 根据文件路径上传
     *
     * @param baseDir 相对应用的基目录
     * @param file    上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static final String upload(String baseDir, MultipartFile file) throws IOException {
        try {
            return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (FileException fe) {
            throw new IOException(fe.getDefaultMessage(), fe);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 文件上传
     *
     * @param baseDir          相对应用的基目录
     * @param file             上传的文件
     * @param allowedExtension 上传文件类型
     * @return 返回上传成功的文件名
     * @throws FileSizeLimitExceededException       如果超出最大大小
     * @throws FileNameLengthLimitExceededException 文件名太长
     * @throws IOException                          比如读写文件出错时
     * @throws InvalidExtensionException            文件校验异常
     */
    public static String upload(String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException {
        int fileNamelength = Objects.requireNonNull(file.getOriginalFilename()).length();
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
            throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
        }

        assertAllowed(file, allowedExtension);

        String fileName = extractFilename(file);

        String absPath = getAbsoluteFile(baseDir, fileName).getAbsolutePath();
        file.transferTo(Paths.get(absPath));
        return getPathFileName(fileName);
    }


    /**
     * 上传文件到 MinIO
     *
     * @param file 上传的文件
     * @return 文件的完整访问 URL（如 http://localhost:9000/images/xxx.jpg）
     * @throws Exception 上传失败时抛出异常
     */
    public  static  final String upload(MultipartFile file) throws Exception {
        // 1. 参数校验
        if (file.isEmpty()) {
            throw new IllegalArgumentException("文件不能为空");
        }

        // 2. 生成安全文件名（防止重复和路径遍历）
        String originalFilename = file.getOriginalFilename();
        if (originalFilename == null) {
            throw new IllegalArgumentException("文件名无效");
        }
        String fileExtension = originalFilename.substring(originalFilename.lastIndexOf("."));
        String safeFilename = UUID.randomUUID().toString() + fileExtension;

        // 3. 初始化 MinIO 客户端
        MinioClient minioClient = MinioClient.builder()
                .endpoint(URL)
                .credentials(ACCESS_KEY, SECRET_KEY)
                .build();

        // 4. 确保存储桶存在
        boolean found = minioClient.bucketExists(BucketExistsArgs.builder().bucket(BUCKET_NAME).build());
        if (!found) {
            minioClient.makeBucket(MakeBucketArgs.builder().bucket(BUCKET_NAME).build());
        }

        // 5. 上传文件
        minioClient.putObject(
                PutObjectArgs.builder()
                        .bucket(BUCKET_NAME)
                        .object(safeFilename)  // 对象名称（即 MinIO 中的路径）
                        .stream(file.getInputStream(), file.getSize(), -1)
                        .contentType(file.getContentType())
                        .build()
        );

        // 6. 生成访问 URL（假设存储桶是公开的）
        return String.format("%s/%s/%s", URL,  BUCKET_NAME, safeFilename);

        // 如果存储桶是私有的，使用预签名 URL（有效期 24 小时）：
        // return minioClient.getPresignedObjectUrl(
        //     GetPresignedObjectUrlArgs.builder()
        //         .bucket(BUCKET_NAME)
        //         .object(safeFilename)
        //         .method(Method.GET)
        //         .expiry(24, TimeUnit.HOURS)
        //         .build()
        // );
    }


    /**
     * 编码文件名
     */
    public static final String extractFilename(MultipartFile file) {
        return StringUtils.format("{}/{}_{}.{}", DateUtils.datePath(),
                FilenameUtils.getBaseName(file.getOriginalFilename()), Seq.getId(Seq.uploadSeqType), FileTypeUtils.getExtension(file));
    }

    private static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException {
        File desc = new File(uploadDir + File.separator + fileName);

        if (!desc.exists()) {
            if (!desc.getParentFile().exists()) {
                desc.getParentFile().mkdirs();
            }
        }
        return desc.isAbsolute() ? desc : desc.getAbsoluteFile();
    }

    private static final String getPathFileName(String fileName) throws IOException {
        String pathFileName = "/" + fileName;
        return pathFileName;
    }

    /**
     * 文件大小校验
     *
     * @param file 上传的文件
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException      文件校验异常
     */
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException {
        long size = file.getSize();
        if (size > DEFAULT_MAX_SIZE) {
            throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
        }

        String fileName = file.getOriginalFilename();
        String extension = FileTypeUtils.getExtension(file);
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension)) {
            if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION) {
                throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION) {
                throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION) {
                throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.VIDEO_EXTENSION) {
                throw new InvalidExtensionException.InvalidVideoExtensionException(allowedExtension, extension,
                        fileName);
            } else {
                throw new InvalidExtensionException(allowedExtension, extension, fileName);
            }
        }
    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     *
     * @param extension        上传文件类型
     * @param allowedExtension 允许上传文件类型
     * @return true/false
     */
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension) {
        for (String str : allowedExtension) {
            if (str.equalsIgnoreCase(extension)) {
                return true;
            }
        }
        return false;
    }
}